Rivet Nut specification:M3 ,M4 ,M5, M6, M8 ,M10 ,M12, inch: 1/2,3/8,1/ ... . also we can produce according to customer the drawing.specification:M3 ,M4 ,M5, M6, M8 ,M10 ,M12, inch: 1/2,3/8,1 ... 3/16,5/16. material: steel, stainless steel, brass,aluminium. M4-M10 flat head hex Rivet nut